We work with a degenerate 2D Bose gas of \(^{87}\) Rb atoms. The main experimental setup has been described previously in [1]}, [2]}. Briefly, about \(10^5\)  Rb atoms in the \(F = 1, m =0\)  hyperfine ground state are loaded into a 2D box potential. The vertical confinement is provided by a vertical lattice. All atoms are trapped around a single node of the lattice in an approximately harmonic potential with a measured trap frequency \(\omega _z/2\pi = 4.1(1)\)  kHz. The in-plane trap is provided by a hard-wall potential created by a first DMD (DMD1 in the following) All DMDs used in this work are DLP7000 from Texas Instruments and interfaced by Vialux GmbH.. All laser beams used for creating the 2D box potential have a wavelength of 532 nm and thus repel Rb atoms from high intensity regions. The cloud temperature is controlled by lowering the in-plane potential height, thus enabling evaporative cooling. We reach temperatures below \(30\,\) nK and an average 2D atom density of \(\sim \)  80 \({}^{-2}\) , corresponding to a regime where the cloud is well described by the Thomas-Fermi approximation. Both the interaction energy and thermal energy are smaller than the vertical trapping frequency and the atom cloud is thus in the so-called quasi-2D regime.
